Add codex-task-server-sync skill

codex-task-server-sync/agents/openai.yaml

@@ -0,0 +1,4 @@
+interface:
+  display_name: "Codex Task Sync"
+  short_description: "Migrate a Codex workspace to a server and keep it synced"
+  default_prompt: "Use $codex-task-server-sync to migrate this macOS Codex workspace to my Linux server, create or reuse a Gitea repo, and keep both sides synchronized."